Bunsen burner



g- 1929- E. BANDOLY ET Al.

BUNSEN BURNER Filed Aug. 2, 192

Patented Aug. 6, 1929.

UNITED STATES PATENT OFFICE.

ERICI-I BANDOLY AND EERMAN PAUL SACHSE, OE CHICAGO, ILLINOIS, ASSIGNORS TO CENTRAL SCIENTIFIC COMPANY, A CORPORATION OF ILLINOIS.

BUNSEN BURNER.

Application filed August 2, 1926.

This invention relates to Bunsen burners of the type customarily used in laboratories and has for its particular object to reduce the cost of production while maintaining the efficiency and durability of the article.

The preferred embodiment of the invention is illustrated in the accompanying drawings, in which Fig. 1 is a side elevation of the burner;

Fig. 2 is a similar side elevation with the individual parts slightly separated;

Fig. 3 is a sectional view taken on line 33 of Fig. 1;

Fig. 4 is a similar sectional view taken at right angles to the section shown in Fig. 3;

Fig. 5 is a tranver-se section taken on line 5-5 of Fig. 1; and

Fig. 6 is a similar section taken on line 66 of Fig. 3; and

Fig. 7 is a sectional view similar to 3 illustrating a slight modification in which the shutter as a separate part is eliminated.

The burner shown in Figs. 1 to 6 includes a pedestal A, a body portion B, a shutter C and a tube D.

The pedestal A is a sheet metal stamping comprising a saucer shaped portion 10 having a down turned rim 11 provided with feet 12. In the center of the saucer-shaped portion, there is an opening having opposed curved walls 13 separated by notches 14 having straight sides 15 and curved ends, 16.

The body includes a cylindrical base 17, having an upwardly projecting cylindrical stem 18, a downwardly projecting neck 19, provided with laterally extending cars and a laterally projecting hose nipple 21.

Above 'the neck 19 is a shoulder 22 adapted to rest on the top of the pedestal when the neck 19 is located in the opening between the curved walls 13. The ears 20 are shaped to correspond with the notches 14 and bear against the under side of the saucer-shaped portion 10 adjacent to the curved walls 13. The neck is provided with slight eccentrics 23 lying between the shoulder 22 and the ears 20 and serving to bind against the walls 13, when the ears have been inserted thru the notches 1d and rotated to the position shown in Fig. 6.

The stem 18 is somewhat smaller than the base 17, whereby shoulder 24 is formed on the body B and against which the shutter C rests. Spaced from the shoulder, the

Serial No. 126,365.

stem is provided with a transverse passage 25 substantially rectangular in vertical cross section and deeper on one side indicated at 26 in Fig. 3 than on the other. Above the passage 25, the stem has a cylindrical bore 27 which joins the passage to form a conduit for air and gas. The junction of the cylinder with the rectangular passage results in shoulders 28 upon which the bottom of the tube D rests as best shown in Fig. 4:.

Below the shallow side of the passage 25, the outer wall of the stem is provided with a circumferential pocket 29 adapted to receive and cooperate with a stop 30 of Fig. 5 on the shutter G whereby the latter is lllnited in its rotary movement by the stem The nipple 21 is provided with the conical ribs 31 for cooperation with the gas hose commonly used in the laboratory. The bore 32 of the nipple is connected with the conduit formed in the stem by a small upright here 3.3 of uniform diameter extending iii-bin the inner end of the'bore 32 thru the bottom of the passage 25 between the air induction ports formed in the walls of the stem by such passage. I

A slight swell or boss 40 may be provided about the upper end of the bore for directing solid products of combustion away from said bore.

The body B is most advantageously made in one piece of an aluminum die casting. The passage 32 in the nipple 21, the trans verse passage 25 in the stem 18 and the cylindrical bore above it might be formed by movable cores operating in the die. The upright passage 33 also be formed by a core but it is so small that the core could endure only a small period of service and we prefer to drill this passage, the die material forming a slight depression to guide the point of the drill.

By making the parting line include the vertical axis and the axis of the nipple 21, the pocket 29 can be easily formed by a fixed core or projection in the die and the ears 20 can be formed by corresponding pockets in the die cavity.

The shutter or sleeve valve C is a punch press product made from sheet aluminum, brass or nickel silver punched to provide the air induction ports 34 and rolled into cylindrical form to telescope with the stem 18.

Before being bent into cylindrical form, said shutter is a rectangular sheet having a projection or stop 30 on one end and a corresponding notch 300 on the other so that when the sheet is rolled to cylindrical form the projection or stop 30 will be received in the notch 300 and the ends will be in contact or adjacent to each other as clearly shown in Fig. 2.

The tube D is nickel-plated brass tubing cut to a proper length and of a size to fit closely in the bore 27 against the shoulders 28.

In assembling the cars 20 are inserted thru the notches 14 and rotated to the position shown in Fig. 6. The shutter C is telescoped with the stem and the stop 30 struck in. The tube D is pressed into the bore 27 against the shoulders 28 and the device is complete.

The sheet metal pedestal is preferred because of the great economy with which it can be produced but some of the advantages of the invention would be retained if it were otherwise made.

The body portion is made by die casting which permits a number of machine operations to be eliminated and furnishes the body portion with great uniformity at a very low cost. hen these castings come from the die, they require only a light trimming operation and tumbling to make them complete and ready for use. The gate is ordinarily opposite to the nipple 21 and hence the sprue is in a very convenient position for removal. As stated, this part of the burner is preferably made of aluminum because of its adaptability to die casting as well as its ability to resist the corrosive atmosphere of the laboratory and the ease with which it can be cleaned. The nipple 21 can be made 'in a separate piece but while this will slightly reduce the cost of the body portion casting, it will be more than offset by the cost of connecting the separate nipple to the body portion.

The body portion and pedestal can, of course, be made in one piece but it is somewhat diiiicult to make a die casting as thin and wide as the pedestal should be; but more important, the cost of that amount of aluminum, zinc alloy or brass metal exceeds the cost of making the pedestal by stamping and assembling it to the base.

The construction offers the greatest economy but some variations can be indulged in without bringing the cost up to the present process. e

The tube D is made of nickel-plated brass because it will stand'the temperatures and resist the corrosive atmosphere. Solid nickel would be preferred except for its great cost. In the modified form shown in Fig. 7 the .bo're35 corresponding to the bore 27 is ex tended to the bottom of the air induction ports 36 eliminating the shoulders 28. The

tube 87 is rotatably mounted in the bore 35 and provided with slots 38 corresponding to the openings 34 whereby the tube is made to perform the functions of tube and shutter.

Other modifications embodying the substance of the invention will readily suggest themselves to those skilled in the art and are intended to be covered by the claims.

We claim as our invention:

1. In a Bunsen burner, a pedestal of pressed metal, a separately formed die cast body secured-to the pedestal and including a hollow nipple for connection with a supply of gas and a hollow stem in communication with the nipple and having air induction ports therein, and a circumferential laterally opening p0cket,,in its outer wall, a tube extending upwardly from the stem and a perforated shutter surrounding the stem and provided with a limiting stop operating in said pocket.

2. In a Bunsen burner a pedestal having a central opening with curved walls spaced by notches, and a die cast body portion including a shoulder resting on the pedestal, a neck extending thru the opening and having eccentrics engaging said curved walls, and laterally projecting ears corresponding to said notches and bearing on the under side of the pedestal outwardly from the curved walls of the opening.

8. In a Bunsen burner a pedestal having 'a central opening with curved walls spaced by notches, a die cast body portion having longitudinal and transverse openings therein, a laterally extending gas nipple integral with said body portion, a shoulder on the body portion below said nipple resting on the pedestal, a neck extending thru the opening and laterally projecting ears corresponding to said notches and bearing on the under side of the pedestal outwardly from the curved walls ofthe opening.

4. In a Bunsen burner, an integral die cast body portion including an upwardly directed, reduced stem provided with a transverse opening formingopposed air induction ports and a counterbore in its upper end communicating with an opening and terminating in opposed shoulders, a laterally directed gas nipple below the stem and communicating with the transverse opening thru a vertical passage, the stem being provided with a circumferential pocket below one of the air induction ports.

5. In a Bunsen burner a one piece die cast body portion including a bottom having means for detachably securing it to a pedestal, an upwardly directed hollow stem havfor receiving a sleeve for constitutin a" shutter for controlling the size of said ports.

6. In a Bunsen burner, an integral die cast body comprising a base having an upwardly directed passage, a stem projecting upwardly from the base and having a relatively larg longitudinal chamber open at the top, into the lowered end of which the gas passage discharges, and having also laterally extending air induction ports coinmunicating with the longitudinal bore and a laterally projecting hollow gas nipple integral with said body portion and in co1nmunication with the upwardly directed gas passage, a separately formed pedestal on which the body is mounted, means for varying the size of said ports and an upwardly directed flue telescoping at its lowered end with the stem.

7. In a Bunsen burner, an integral die ast body including a base having a gas passage delivering upwardly, an upwardly directed hollow stem integral with said base and having a relatively large longitudinal chamber in communication with said pas- Sage and opening upward, said stem being provided with lateral air induction ports opening into said chamber, a laterally extending hollow gas nipple integral with said base and communicating with the gas passage therein, and means integral with the lower end of said base for detachably interlocking the same with a pedestal.

8. In a Bunsen burner, an integral die cast body including a base having an clongated gas passage of uniform diameter throughout its length opening upwardly, an upwardly extending stem integral with said base, said stem being provided with a relatively large cavity in communication with said passage and opening upwardly and having lateral induction ports, a laterally extending gas nipple integral with said base and having a gas passage extending longitudinally thereof, the first named gas passage being of materially less cross-sectional area than the passage in said nipple and in communication therewith, and means adjustably mounted on said body for controlling the supply of air to said cavity through said ports.

In testimony whereof we afiix our signatures.

ERICH BANDOLY. HERMAN PAUL SACHSE. 

